Function paho_mqtt_sys::MQTTAsync_getPendingTokens

pub unsafe extern "C" fn MQTTAsync_getPendingTokens(
    handle: MQTTAsync, 
    tokens: *mut *mut MQTTAsync_token
) -> c_int

This function sets a pointer to an array of tokens for messages that are currently in-flight (pending completion).

Important note: The memory used to hold the array of tokens is malloc()'d in this function. The client application is responsible for freeing this memory when it is no longer required. @param handle A valid client handle from a successful call to MQTTAsync_create(). @param tokens The address of a pointer to an ::MQTTAsync_token. When the function returns successfully, the pointer is set to point to an array of tokens representing messages pending completion. The last member of the array is set to -1 to indicate there are no more tokens. If no tokens are pending, the pointer is set to NULL. @return ::MQTTASYNC_SUCCESS if the function returns successfully. An error code is returned if there was a problem obtaining the list of pending tokens.